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what's interval for x ?

i have no clue, im doing the work sheet and that is all it says for this question

it says solve for x

|dw:1371573363440:dw|

remember complimentary angles

the answer choices are 20, -11, 10.75, or 11.75

forget your answers, understand concept

oppss 815 not 817, hihi :)

hi :)

do u see how complimentary angles work now

in a right angled triangle the 2 other angles must add up to 90

Im really slow at picking up these concepts.....:/ so this im reallly lost..

hmm how else can i explain it

btw i really appriciate the help you guysss!!

no lets do it between 4 to pi+4 for 1 interval of your cos(2x-4)

hmmm.. for easier, solve this algebrically :)
can u solve for x, this part :
|dw:1371574314002:dw|

first solve an x that works and ill show u how u can find all the other xs that work

|dw:1371574763654:dw|

cos(2x-4)=cos(90-6x)
a)2x-4=90-6x+360k
b)2x-4=6x-90+360k
a)x=94/8+45k
b)x=86/4+90k

x=11.75